test: skip a test on failing test on nacl/386
test: skip a test on failing test on nacl/386

This test was designed for #15609 and didn't consider nacl. It's not
worth adding new +build-guarded assembly files in issue15609.dir for
nacl, especially as nacl is going away.

Fixes #32206

Change-Id: Ic5bd48b4f790a1f7019100b8a72d4688df75512f
Reviewed-on: https://go-review.googlesource.com/c/go/+/178698
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

nawawi/go,nawawi/go,cloudflare/go,cloudflare/go,CAFxX/go,cloudflare/go,nawawi/go,golang/go,nawawi/go,nawawi/go,CAFxX/go,akutz/go,akutz/go,golang/go,akutz/go,akutz/go,CAFxX/go,CAFxX/go,nawawi/go,golang/go,cloudflare/go,golang/go,akutz/go,akutz/go,CAFxX/go,akutz/go,cloudflare/go,golang/go,CAFxX/go,CAFxX/go,akutz/go,cloudflare/go,golang/go,cloudflare/go,nawawi/go,nawawi/go,cloudflare/go,golang/go,CAFxX/go,golang/go